text: Salicylaldoxime is the conjugate acid of a bidentate ligand:
  :2 CHCH=NOH-2-OH  +  Cu   →   Cu(CHCH=NOH-2-O)  +  2 H
  In highly acidic media, the ligand protonates, and the metal aquo complex and aldoxime are liberated.  In this way the ligand is used as a recyclable extractant.
  It typically forms charge-neutral complexes with divalent metal ions.